Portable air treatment unit



FIG. 1 is a top and side perspective view of a portable air treatment unit showing my new design;

FIG. 2 is a side elevation view thereof, which is the same from opposite sides;

FIG. 3 is a front elevation view thereof;

FIG. 4 is rear elevation view thereof;

FIG. 5 is a top plan view thereof; and,

FIG. 6 is a bottom view thereof;

The portions of the portable air treatment unit shown in dotted lines do not constitute a part of the claimed design. 

CLAIM The ornamental design for a portable air treatment unit, as shown and described. 